DeLeon, who holds a PhD from the University of Connecticut, does research in the areas of cultural studies, anarchist theory, post-colonialism, and animal studies in educational theory. His articles that have appeared in The Social Studies, The Journal for Critical Education Policy Studies, Educational Studies, Equity & Excellence in Education, and Theory and Research in Social Education. He is associate editor of Critical Education, which is based at the University of British Columbia. He has also co-edited two books: Contemporary Anarchist Studies: An Introductory Anthology of Anarchy in the Academy (Routledge, 2009) and Critical Theories, Radical Pedagogies, and Social Education: Towards New Perspectives for Social Studies Education (Sense Publishers, 2010).

Canada Border Services Agency refused to give a reasons for denying DeLeon entry to Canada. CBSA has also repeatedly denied entry to American educator Bill Ayers, a Distinguished Professor at the University of Illinois, Chicago. The CBSA’s actions raise serious concerns for Canadians and Americans who value free speech, open debate and academic freedom.